840878844 has 144 divisors (see below), whose sum is σ = 2242114560. Its totient is φ = 243734400.

The previous prime is 840878791. The next prime is 840878849. The reversal of 840878844 is 448878048.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840878849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10643997 + ... + 10644075.

It is an arithmetic number, because the mean of its divisors is an integer number (15570240).

Almost surely, 2^840878844 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 840878844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1121057280).

840878844 is an abundant number, since it is smaller than the sum of its proper divisors (1401235716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

840878844 is a wasteful number, since it uses less digits than its factorization.

840878844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 1835008, while the sum is 51.

The square root of 840878844 is about 28997.9110282103. The cubic root of 840878844 is about 943.8677382808.

The spelling of 840878844 in words is "eight hundred forty million, eight hundred seventy-eight thousand, eight hundred forty-four".